Ignition device.



E. M. BENFOBD.

IGNITION DEVICE.

Anmoulol num un. so. loos.

Pabentd Jn. 5', 1909.

inventan ,ganz- UNITED sTATEs PATENT oEErcE.

EDWARD M. BEIIFLTRIJ, 0F MOUNT VEiRNQN, NEW YORK.

IGNITION DEVICE.

To all whom it may concern:

Be it known that I, Enwann M. BENEORD, a citizen voi the United States, residing in Mount Vernon, in the county of Westchester and State of New York, have invented certain new anduseful Improvements in Ignition Devices, of which the following is a specification.

This invention relates to ignition devices and has for an vobject to provide an improved device of this character.

The invention is particularly desi ned to produce an ignition device or spar plug which may have its insulation made of p0rcelain and have the conductor for the sparking point so carried by this porcelain and the porcelainso carried by the metal shell that the contractions and expansions due to change of temperature will not break the porcelain; and one wherein the conductor will be free from the porcelain except at one end where it will be securely held against displacement either axially or angularly although the binding nut is screwed upon it.

In the drawings accompanying and forming a part of this specification Figure 1 is an fen arged view showing a practicable em- ,fbodiment of this present invention; certain portions are shown m elevation and certain portions are shown in central section. Fig. 2 is a broken away portion of the conductor; and Fig. 3 is a broken away perspective 1view of the outer end of the porcelain insu-4 ator.

The shell, designated by 4, will be of some suitable construction, and in the present instance is shown as having a screw threaded portion 5 for engagement with the engine casingto which it may be applied, and the shell 1s shown as carr m a sparking point 6 for co eration with7 51e sparking oint carried y the insulator. This shellis s own as having an outwardly facin shoulder 7 and as being internally screw t readed at 8 above such shoulder. The porcelain niember 9 is provided with a longitudinal bore l0 in which is mounted the conductor 11 which carries the sparking point 12 which will cooperate with some other sparking r1ploint, as for instance the sparking point 6. e diameter of the bore 10 is larger than the diameter of the conductor 1 1 so that this is ractically loose within the insulation aor ed by the porcelain member. This porcelain member is in the nature of an insulation tube. The conductor or stem, as was before stated,

pocicaan of Letten Patent. Application mod January 80, 1908. Serial No. 418,39*.

mmm aan. 5,1909.

has a free it within the insulation tube and is secured to said insulation tube at the outer end. The stem is shown as having a projec-.

tion for enga a socket or notch in the 1nsulator; in tgeniresent instance the projection is shown as a pin 13 passing through and fast with the stem 11, which pin 13 will .be seated in a notch 14 in the bottom of arecess 15 in the end of the insulator. The end of cumferential groove 16. A cap 17 v a thin flange 18 will be screwed onto the screw threaded portion 19 of the conductor stem 11. f

the insulator is also shown as havin a cirf' 'lhe manner of assembling the device is.

substantially as follows: 'lhe stem 11 will be inserted through the porcelain insulator 9 and the projection 13 carried thereby will be seated in the notch or socket 14 after which cement will be filled into the socket 15 above the pin or proection 13 and then the cap 17 will e screwe down until it engages the to or end of the porcelain insulator, after Whic the flange 18 of the cap will be turned over,` into the groove 16 for securely holding the cap in position. 'Ihe portion of the screw threaded end 19 which is above the cap 17 will receive a binding nut 20 and will thereby become the binding ost for the sparking point 12; and there w l thus be a continuous ine of metalfrom the sparking point to the binding post; that is, an integral line of metal extends from the sparking point to the binding post or means of attachment to- Near the end of the insulator from whic the sparking point extends there is provided a ilange 2l, which ormsmeans of connection between the insulator and the shell. In the present instance there are shown packin isks 22 at each side of this ange, one o which will rest u on the shoulder 7., the other of which Wi be engaged b the bushing.

t wil `be readily seen that in my improved ignition device the insulator is supported near the inner end and that most of the porcelain is outside of the ignition chamthe wiring;

ber, and it will also be seen that the relative expansion and contraction between the insulator and the conductinstem will have no power for disrupting or reaking the' arts since'the stem can move freely, as indlcated by the dotted lines 24, 25,-indicating the expanded vposition of the stern relative to the msulator.

The stern or conductor 11 is securely held from rotation by means of its connection with the insulator projections 13 and sockets 14. The binding nut being screw threaded on to the stem would have a tendency to turn the stem and thereby shift the s arking ont 12 in an axial direction, but t e stem is held against such tendency to movement.

Having described my invention I claim:

1. An ignition device comprising a one giace tubular porcelain insulator, a conucting stem having a freeffit within said tubularinsulator and having. its ends `projectin beyond the ends of the insulator, one of sai proJectm ends constituting a sparkpoint and t e other of said projectin ends constituting a binding post, and a meta cap rigid with said stem at the binding post end and secured to said insulator, and means carried by the stem and engaging the insulator for preventing ular movement of one of these relative to t e other.

2. An ignition device comprising a orcelain tube having a recess in one en and notches in the recess, a conducting stem cass within said tubular porcelain and having a yfree t therein said stem extending at both ends beyond th e ends of the porcelain and constituting at one of said extendm ends a sparking point and the other exten ing end having a screw threaded portion, said stem being provided near the screw threaded ortion with projections seated in said noto es cement within said recess for securing said projections in said notches, a cap; screwed on the screw threaded portion of t e stem, the stem extendinvr beyond said cap and constituting a bin( ing post,` said tubular porcelain having a circumferentialv groove and said cap being turned into said groove, and a binding nut upon said binding post portion for the stem.

Signed at Nos. 9-15 Murra street, New York, N. Y., this 10th day of anuary, 1908.

EDWARD M. BENFORD.

Witnesses:

Clins. LYON RUSSELL, FRED. J. Donn. 

